Abstract:

This study characterized the erosive exhaust behaviors arising in the material of polymethyl metacrylate (PMMA) as a result of intermittent spraying with different nozzle geometries. One of the most important factors affecting the speed of the inducing particles and the mechanism of damage that occurs in the target material in the erosive extinction is the intramuscular geometry. In the industry, different nozzle geometries are used in many different applications, such as processing and rubbing with micro-switching jet. Spraying is one of the methods of material processing with the traditional spraying machine and has many uses such as micro-spraying jet processing, surface processing, surface cleaning. The purpose of this method is to accelerate the transmitting particles through the nitrogen by using a pressure-bearing gas and to hit the target material surface. The maximum stretching rate occurs in the nozzle with a diameter of 5 mm of entrance and exit and a diameter of 4 mm in the middle; the minimum stretching rate is observed in the narrow nozzle geometry with a diameter of 3 mm of exit and a diameter of 2 mm. The maximum and minimum impact field values are also observed in the nozzles where the rate of erosion is achieved. The maximum average surface smoothness occurs after spraying in a 3 mm diameter fixed cutting nozzle, while the minimum average smoothness value occurs in a nozzle with a 5 mm in- and out diameter and a 3 mm diameter throat in the middle.

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